Add IModel.AggregateBounds and ModelAnimation.ScreenBounds.

The bounds define the smallest Rectangle that covers all
rotations of all frames within a model sequence.

OpenRA.Game/Graphics/Model.cs

@@ -10,6 +10,7 @@
 #endregion
 
 using System;
+using System.Drawing;
 using OpenRA.FileSystem;
 
 namespace OpenRA.Graphics
@@ -23,6 +24,9 @@ namespace OpenRA.Graphics
 		float[] Size { get; }
 		float[] Bounds(uint frame);
 		ModelRenderData RenderData(uint section);
+
+		/// <summary>Returns the smallest rectangle that covers all rotations of all frames in a model</summary>
+		Rectangle AggregateBounds { get; }
 	}
 
 	public struct ModelRenderData

OpenRA.Game/Graphics/ModelAnimation.cs

@@ -11,6 +11,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Drawing;
 
 namespace OpenRA.Graphics
 {
@@ -33,6 +34,19 @@ namespace OpenRA.Graphics
 			ShowShadow = showshadow;
 		}
 
+		public Rectangle ScreenBounds(WPos pos, WorldRenderer wr, float scale)
+		{
+			var r = Model.AggregateBounds;
+			var offset = OffsetFunc != null ? OffsetFunc() : WVec.Zero;
+			var xy = wr.ScreenPxPosition(pos) + wr.ScreenPxOffset(offset);
+
+			return Rectangle.FromLTRB(
+				xy.X + (int)(r.Left * scale),
+				xy.Y + (int)(r.Top * scale),
+				xy.X + (int)(r.Right * scale),
+				xy.Y + (int)(r.Bottom * scale));
+		}
+
 		public bool IsVisible
 		{
 			get